Fourth nerve palsy
Encyclopedia
Fourth nerve palsy is a condition caused by weakness or paralysis of the superior oblique muscle
. This condition often causes double vision as the weakened muscle prevents the eyes from moving in the same direction.
When present at birth, it is known as congenital fourth nerve palsy
.
Superior oblique muscle
For the abdominal muscle see: Abdominal external oblique muscleThe superior oblique muscle, or obliquus oculi superior, is a fusiform muscle originating in the upper, medial side of the orbit which abducts, depresses and internally rotates the eye...
. This condition often causes double vision as the weakened muscle prevents the eyes from moving in the same direction.
When present at birth, it is known as congenital fourth nerve palsy
Congenital fourth nerve palsy
Congenital fourth nerve palsy is a condition present at birth characterized by a vertical misalignment of the eyes due to a weakness or paralysis of the superior oblique muscle....
.
See also
- Trochlear nerveTrochlear nerveThe trochlear nerve is a motor nerve that innervates a single muscle: the superior oblique muscle of the eye....
- Harada-Ito procedureHarada-Ito procedureThe Harada-Ito procedure is an eye muscle operation designed to improve the excyclotorsion experienced by some patients with cranial nerve IV palsy. In this procedure, the superior oblique tendon is split, and the anterior fibers -- the fibers most responsible for incyclotorsion -- are moved...